Rubber sealing strips are widely used in automobiles, airplanes, railways, buildings, home appliances, etc., to prevent outside dust, air, water, etc. from entering, and play a good sealing role. The sealing strips are mainly divided into solid sealing strips, sponge sealing strips and composite sealing strips. Among them, a large amount of reclaimed tire rubber can be used in ordinary solid sealing strips, which effectively reduces the cost of raw materials. The editor will share with you today a production formula for the production of low-cost solid sealing strips with a large amount of mixed tire reclaimed rubber.
1. Reference formula for tire reclaimed rubber production sealing strip
60 parts of natural rubber, 40 parts of butadiene rubber, 275 parts of tire reclaimed rubber, 18 parts of zinc oxide, 1.6 parts of stearic acid, 4 parts of antioxidant A, 3 parts of paraffin, 37.5 parts of carbon black N330, 98 parts of light calcium, engine oil 37.5 parts, industrial grease 37.5 parts, accelerator D 0.88 parts, accelerator DM 1.5 parts, accelerator M 5.1 parts, accelerator TMTD 0.25 parts, sulfur 7.25 parts; total: 627.08 parts.
2. Tips for selecting tire reclaimed rubber for sealing strips
When using tire reclaimed rubber to produce low-cost rubber sealing strips, it is recommended to choose a tread reclaimed rubber processed with tire tread rubber powder as the raw material, which has higher effective rubber hydrocarbon content and greater mechanical strength. Choosing high-fineness, no impurities, tire tread reclaimed rubber 2YLYY121, is conducive to the smooth extrusion of the sealing strip, and the surface of the finished product is smoother and brighter. When low-cost rubber sealing strips use reclaimed tire rubber as the main raw material, mixing appropriate amounts of natural rubber and butadiene rubber can further optimize product quality.
3. Basic physical requirements of reclaimed rubber for sealing strips
In the working process of the rubber sealing strip, the elasticity of the lips, cavities, flanges and other parts are mainly used to generate contact pressure with the surface of other contact surfaces to achieve the sealing effect; the rubber material used should have good processing performance and low Mooney viscosity , It is not easy to change color and spray frost, with strong tensile performance, compression and permanent deformation resistance, and certain weather resistance, ozone resistance, cold resistance, etc. Choosing suitable reclaimed rubber raw materials is the basis for ensuring the performance of rubber sealing strips. Through formula adjustment, more types and indexes of sealing strips can be produced to meet the needs of different use occasions.
4. Formula design skills for tire reclaimed rubber sealing strips
When using reclaimed tire rubber to produce low-cost rubber sealing strips, sulfur vulcanization, combined with accelerator D/DM/M/TMTD, has good vulcanization performance and vulcanization effect. The filling system is reinforced with carbon black N330 and filled with light calcium, which can give the rubber good elasticity, tensile properties, tear resistance, abrasion resistance, etc. It is recommended to use engine oil and industrial grease for the softening system. The anti-aging system combines chemical anti-aging agents such as anti-aging agent A with physical protective agents such as paraffin, and the finished sealing strip has better anti-aging performance.
Every year in my country, a large number of waste tires are produced, a large part of which is used to process reclaimed rubber, which is recycled into rubber tires, rubber sheets, rubber pads, rubber soles, conveyor belts, sealing strips, sealing rings, waterproof membranes, In the production of coating glue and other products, the cost of raw materials is effectively reduced under the premise of ensuring product quality. In actual production, continuous research on the application skills of tire reclaimed rubber in sealing strips can further expand the scope of use of tire reclaimed rubber and solve the problem of more waste tires polluting the environment.
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